How to inject Mounjaro: sites, timing and missed doses

Q: Can Mounjaro be taken every two weeks?

No. Mounjaro is labeled as a weekly shot.

Q: What does Mounjaro cost?

The list price is $1,112.16 for a 28-day box of four pens. Lilly's savings card can cut that to $25 with commercial coverage, or to as low as $499 if your commercial plan does not cover it.

How to use Mounjaro: injection sites, timing and missed doses

Mounjaro goes under the skin of the belly or thigh once a week, and a helper may use the back of your upper arm ^[1]. Pick a new spot each week. Morning, night, before or after food: the label allows any of them ^[1]. A forgotten shot can still be given up to 4 days late; past that point, leave it out and wait for your normal day ^[1].

Updated Oct 17, 2026By the Wellchosen Health editorial team

Medical review: pending. A licensed clinician has not yet reviewed this page.

Picking an injection spot

Two areas are listed for injecting yourself: the abdomen and the thigh ^[1]. A third, the back of the upper arm, is listed only for shots given by another person ^[1]. Move to a fresh spot every week ^[1]. Nothing in the label ranks one area above another, so choose whichever is easier for you to reach and see. Dose amounts are covered on Mounjaro dosage.

Choosing your weekly day and time

Mounjaro is a once-a-week shot. Morning and bedtime are both fine, and you do not need to plan it around food ^[1].
Need a new day? Moving it, even one or two days earlier, is allowed as long as 3 days (72 hours) or more separate the last shot and the next one ^[1].
Spacing shots two weeks apart is not a schedule the label describes ^[1].

Pens, KwikPens and vials

There are four device types: a single-dose pen, a single-dose vial, a KwikPen that holds 4 doses, and a 4-dose multi-dose vial ^[3]. Every carton has its own Instructions for Use. We were not able to read those leaflets for this page, so rely on the printed copy in your box and have a pharmacist walk you through your first shot. With a vial, the label calls for a syringe that measures 0.5 mL or 0.6 mL, plus a fresh syringe and needle each time ^[3]. A KwikPen is for one person only, even if the needle is swapped ^[3], and the label does not recommend it for people with poor eyesight injecting alone or for children injecting themselves ^[3]. Room-temperature limits are discussed on Mounjaro storage.

Also on insulin? Keep the two in separate shots and do not combine them in one syringe. Using the same part of the body is fine if the spots are not side by side ^[1]. In trials, 3.2% of people on Mounjaro had a skin reaction where they injected, compared with 0.4% on placebo ^[1]. Your pharmacy or town waste program can tell you how to get rid of used sharps.

Late, skipped or doubled shots

Forgot your shot? You have 4 days (96 hours) to give it ^[1]. Once more than 4 days have gone by, drop that dose and carry on with your normal day ^[1]. Never inject twice to make up for it, and check with your prescriber before skipping a week on purpose. For an accidental extra dose, phone your prescriber or poison control, and call 911 if symptoms are severe. Because tirzepatide's half-life is about 5 days ^[1], effects such as nausea or low blood sugar may not pass quickly. Other medicines that interact are listed on Mounjaro interactions.

Know the warning signs

Belly pain that is severe and does not ease, with or without vomiting, means stop Mounjaro and phone your prescriber ^[1]. Swelling of the lips, face or throat, or struggling to breathe, needs 911 ^[1]. People who also take insulin or a sulfonylurea should know the signs of a low ^[1]. Let the anesthesia team know about Mounjaro before any procedure ^[1]. On birth control pills? The label asks for a non-oral method or an added barrier method for 4 weeks after the first dose and after every dose increase ^[1].

Mounjaro and weight loss

Mounjaro's labeled uses are type 2 diabetes and lowering heart risk in type 2 diabetes; weight loss is not one of them ^[1]. The tirzepatide brand with a weight-management label is Zepbound ^[3]. General tirzepatide shot steps are on how to use tirzepatide, and online options are on getting tirzepatide online.

What a month of Mounjaro costs

Before insurance, a 28-day box of four Mounjaro pens lists at $1,112.16 on Lilly's site ^[2]. Lilly's savings card has two tiers: as little as $25 if your commercial plan covers Mounjaro, and as low as $499 a month if your commercial plan does not ^[4]. The card is not open to uninsured buyers or to people on government plans, and it runs out December 31, 2026 ^[4]. We checked these figures on October 17, 2026. For comparison, LillyDirect sells Zepbound self-pay starting at $299 a month for the 2.5 mg dose (checked the same day) ^[5]. More on Mounjaro cost and Mounjaro vs Zepbound.

Questions people ask

What parts of the body can Mounjaro go in?

You can inject your own belly or thigh. A caregiver can also use the back of your upper arm. Change spots every week ^[1].

Is the stomach or the thigh better for Mounjaro?

Neither. Both are listed on the label, and it does not say one works better than the other ^[1].

Should I take Mounjaro in the morning or at night?

Either. The label allows any time of day, with or without food, as long as it is once a week ^[1].

Can I give my Mounjaro shot a day early?

Yes, as long as at least 3 days (72 hours) separate it from your last shot. Stick with the new day from then on ^[1].

I forgot my Mounjaro shot. What now?

Give it if no more than 4 days (96 hours) have passed. After 4 days, skip that one and go back to your normal day ^[1].

Can Mounjaro be taken every two weeks?

No. Mounjaro is labeled as a weekly shot ^[1].

Is Mounjaro a pill or a shot?

A shot. It goes under the skin once a week from a pen, KwikPen or vial ^[3].

What does Mounjaro cost?

The list price is $1,112.16 for a 28-day box of four pens ^[2]. Lilly's savings card can cut that to $25 with commercial coverage, or to as low as $499 if your commercial plan does not cover it ^[4].